+/* +------------------------------------+
+ * | Inspire Internet Relay Chat Daemon |
+ * +------------------------------------+
+ *
+ * InspIRCd: (C) 2002-2008 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
+ * This program is free but copyrighted software; see
+ * the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
#ifndef INSPIRCD_SQLAPI_2
#define INSPIRCD_SQLAPI_2
+#include <string>
+#include <deque>
+#include <map>
+#include "modules.h"
+
+/** Identifiers used to identify Request types
+ */
#define SQLREQID "SQLv2 Request"
#define SQLRESID "SQLv2 Result"
#define SQLSUCCESS "You shouldn't be reading this (success)"
-#include <string>
-#include <vector>
-#include <map>
-#include "modules.h"
+/** Defines the error types which SQLerror may be set to
+ */
+enum SQLerrorNum { NO_ERROR, BAD_DBID, BAD_CONN, QSEND_FAIL, QREPLY_FAIL };
-enum SQLerrorNum { NO_ERROR, BAD_DBID, BAD_CONN, QSEND_FAIL };
+/** A list of format parameters for an SQLquery object.
+ */
+typedef std::deque<std::string> ParamL;
+/** The base class of SQL exceptions
+ */
class SQLexception : public ModuleException
{
+ public:
+ SQLexception(const std::string &reason) : ModuleException(reason)
+ {
+ }
+
+ SQLexception() : ModuleException("SQLv2: Undefined exception")
+ {
+ }
};
+/** An exception thrown when a bad column or row name or id is requested
+ */
class SQLbadColName : public SQLexception
{
public:
- SQLbadColName() { }
+ SQLbadColName() : SQLexception("SQLv2: Bad column name")
+ {
+ }
};
+/** SQLerror holds the error state of any SQLrequest or SQLresult.
+ * The error string varies from database software to database software
+ * and should be used to display informational error messages to users.
+ */
class SQLerror : public classbase
{
+ /** The error id
+ */
SQLerrorNum id;
+ /** The error string
+ */
std::string str;
public:
+ /** Initialize an SQLerror
+ * @param i The error ID to set
+ * @param s The (optional) error string to set
+ */
SQLerror(SQLerrorNum i = NO_ERROR, const std::string &s = "")
: id(i), str(s)
- {
+ {
}
-
+
+ /** Return the ID of the error
+ */
SQLerrorNum Id()
{
return id;
}
-
+
+ /** Set the ID of an error
+ * @param i The new error ID to set
+ * @return the ID which was set
+ */
SQLerrorNum Id(SQLerrorNum i)
{
id = i;
return id;
}
-
+
+ /** Set the error string for an error
+ * @param s The new error string to set
+ */
void Str(const std::string &s)
{
str = s;
}
-
+
+ /** Return the error string for an error
+ */
const char* Str()
{
if(str.length())
return str.c_str();
-
+
switch(id)
{
case NO_ERROR:
return "Invalid connection";
case QSEND_FAIL:
return "Sending query failed";
+ case QREPLY_FAIL:
+ return "Getting query result failed";
default:
- return "Unknown error";
+ return "Unknown error";
}
}
};
+/** SQLquery provides a way to represent a query string, and its parameters in a type-safe way.
+ * C++ has no native type-safe way of having a variable number of arguments to a function,
+ * the workaround for this isn't easy to describe simply, but in a nutshell what's really
+ * happening when - from the above example - you do this:
+ *
+ * SQLrequest foo = SQLrequest(this, target, "databaseid", SQLquery("SELECT (foo, bar) FROM rawr WHERE foo = '?' AND bar = ?", "Hello", "42"));
+ *
+ * what's actually happening is functionally this:
+ *
+ * SQLrequest foo = SQLrequest(this, target, "databaseid", query("SELECT (foo, bar) FROM rawr WHERE foo = '?' AND bar = ?").addparam("Hello").addparam("42"));
+ *
+ * with 'query()' returning a reference to an object with a 'addparam()' member function which
+ * in turn returns a reference to that object. There are actually four ways you can create a
+ * SQLrequest..all have their disadvantages and advantages. In the real implementations the
+ * 'query()' function is replaced by the constructor of another class 'SQLquery' which holds
+ * the query string and a ParamL (std::deque<std::string>) of query parameters.
+ * This is essentially the same as the above example except 'addparam()' is replaced by operator,(). The full syntax for this method is:
+ *
+ * SQLrequest foo = SQLrequest(this, target, "databaseid", (SQLquery("SELECT.. ?"), parameter, parameter));
+ */
+class SQLquery : public classbase
+{
+public:
+ /** The query 'format string'
+ */
+ std::string q;
+ /** The query parameter list
+ * There should be one parameter for every ? character
+ * within the format string shown above.
+ */
+ ParamL p;
+
+ /** Initialize an SQLquery with a given format string only
+ */
+ SQLquery(const std::string &query)
+ : q(query)
+ {
+ }
+
+ /** Initialize an SQLquery with a format string and parameters.
+ * If you provide parameters, you must initialize the list yourself
+ * if you choose to do it via this method, using std::deque::push_back().
+ */
+ SQLquery(const std::string &query, const ParamL ¶ms)
+ : q(query), p(params)
+ {
+ }
+
+ /** An overloaded operator for pushing parameters onto the parameter list
+ */
+ template<typename T> SQLquery& operator,(const T &foo)
+ {
+ p.push_back(ConvToStr(foo));
+ return *this;
+ }
+
+ /** An overloaded operator for pushing parameters onto the parameter list.
+ * This has higher precedence than 'operator,' and can save on parenthesis.
+ */
+ template<typename T> SQLquery& operator%(const T &foo)
+ {
+ p.push_back(ConvToStr(foo));
+ return *this;
+ }
+};
+
+/** SQLrequest is sent to the SQL API to command it to run a query and return the result.
+ * You must instantiate this object with a valid SQLquery object and its parameters, then
+ * send it using its Send() method to the module providing the 'SQL' feature. To find this
+ * module, use Server::FindFeature().
+ */
class SQLrequest : public Request
{
public:
- std::string query;
+ /** The fully parsed and expanded query string
+ * This is initialized from the SQLquery parameter given in the constructor.
+ */
+ SQLquery query;
+ /** The database ID to apply the request to
+ */
std::string dbid;
+ /** True if this is a priority query.
+ * Priority queries may 'queue jump' in the request queue.
+ */
bool pri;
+ /** The query ID, assigned by the SQL api.
+ * After your request is processed, this will
+ * be initialized for you by the API to a valid request ID,
+ * except in the case of an error.
+ */
unsigned long id;
+ /** If an error occured, error.id will be any other value than NO_ERROR.
+ */
SQLerror error;
-
- SQLrequest(Module* s, Module* d, const std::string &q, const std::string &id, bool p = false)
- : Request(SQLREQID, s, d), query(q), dbid(id), pri(p), id(0)
+
+ /** Initialize an SQLrequest.
+ * For example:
+ *
+ * SQLrequest req = SQLrequest(MyMod, SQLModule, dbid, SQLquery("INSERT INTO ircd_log_actors VALUES('','?')" % nick));
+ *
+ * @param s A pointer to the sending module, where the result should be routed
+ * @param d A pointer to the receiving module, identified as implementing the 'SQL' feature
+ * @param databaseid The database ID to perform the query on. This must match a valid
+ * database ID from the configuration of the SQL module.
+ * @param q A properly initialized SQLquery object.
+ */
+ SQLrequest(Module* s, Module* d, const std::string &databaseid, const SQLquery &q)
+ : Request(s, d, SQLREQID), query(q), dbid(databaseid), pri(false), id(0)
{
}
-
+
+ /** Set the priority of a request.
+ */
+ void Priority(bool p = true)
+ {
+ pri = p;
+ }
+
+ /** Set the source of a request. You should not need to use this method.
+ */
void SetSource(Module* mod)
{
source = mod;
}
};
+/**
+ * This class contains a field's data plus a way to determine if the field
+ * is NULL or not without having to mess around with NULL pointers.
+ */
class SQLfield
{
public:
- /* The data itself */
+ /**
+ * The data itself
+ */
std::string d;
- /* If the field was null */
+ /**
+ * If the field was null
+ */
bool null;
- SQLfield(const std::string &data, bool n)
+ /** Initialize an SQLfield
+ */
+ SQLfield(const std::string &data = "", bool n = false)
: d(data), null(n)
{
-
+
}
};
+/** A list of items which make up a row of a result or table (tuple)
+ * This does not include field names.
+ */
typedef std::vector<SQLfield> SQLfieldList;
+/** A list of items which make up a row of a result or table (tuple)
+ * This also includes the field names.
+ */
typedef std::map<std::string, SQLfield> SQLfieldMap;
+/** SQLresult is a reply to a previous query.
+ * If you send a query to the SQL api, the response will arrive at your
+ * OnRequest method of your module at some later time, depending on the
+ * congestion of the SQL server and complexity of the query. The ID of
+ * this result will match the ID assigned to your original request.
+ * SQLresult contains its own internal cursor (row counter) which is
+ * incremented with each method call which retrieves a single row.
+ */
class SQLresult : public Request
{
public:
+ /** The original query string passed initially to the SQL API
+ */
std::string query;
+ /** The database ID the query was executed on
+ */
std::string dbid;
- SQLerror error;
+ /**
+ * The error (if any) which occured.
+ * If an error occured the value of error.id will be any
+ * other value than NO_ERROR.
+ */
+ SQLerror error;
+ /**
+ * This will match query ID you were given when sending
+ * the request at an earlier time.
+ */
+ unsigned long id;
- SQLresult(Module* s, Module* d)
- : Request(SQLRESID, s, d)
+ /** Used by the SQL API to instantiate an SQLrequest
+ */
+ SQLresult(Module* s, Module* d, unsigned long i)
+ : Request(s, d, SQLRESID), id(i)
{
}
-
- /* Return the number of rows in the result */
+
+ /**
+ * Return the number of rows in the result
+ * Note that if you have perfomed an INSERT
+ * or UPDATE query or other query which will
+ * not return rows, this will return the
+ * number of affected rows, and SQLresult::Cols()
+ * will contain 0. In this case you SHOULD NEVER
+ * access any of the result set rows, as there arent any!
+ * @returns Number of rows in the result set.
+ */
virtual int Rows() = 0;
-
- /* Return the number of columns in the result */
+
+ /**
+ * Return the number of columns in the result.
+ * If you performed an UPDATE or INSERT which
+ * does not return a dataset, this value will
+ * be 0.
+ * @returns Number of columns in the result set.
+ */
virtual int Cols() = 0;
-
- /* Get a string name of the column by an index number */
+
+ /**
+ * Get a string name of the column by an index number
+ * @param column The id number of a column
+ * @returns The column name associated with the given ID
+ */
virtual std::string ColName(int column) = 0;
-
- /* Get an index number for a column from a string name.
+
+ /**
+ * Get an index number for a column from a string name.
* An exception of type SQLbadColName will be thrown if
* the name given is invalid.
+ * @param column The column name to get the ID of
+ * @returns The ID number of the column provided
*/
virtual int ColNum(const std::string &column) = 0;
-
- /* Get a string value in a given row and column */
+
+ /**
+ * Get a string value in a given row and column
+ * This does not effect the internal cursor.
+ * @returns The value stored at [row,column] in the table
+ */
virtual SQLfield GetValue(int row, int column) = 0;
-
- /* Return a list of values in a row, this should
+
+ /**
+ * Return a list of values in a row, this should
* increment an internal counter so you can repeatedly
* call it until it returns an empty vector.
* This returns a reference to an internal object,
* and therefore the return value is only valid until
* you call this function again. It is also invalid if
* the SQLresult object is destroyed.
+ * The internal cursor (row counter) is incremented by one.
+ * @returns A reference to the current row's SQLfieldList
*/
virtual SQLfieldList& GetRow() = 0;
-
- /* As above, but return a map indexed by key name */
+
+ /**
+ * As above, but return a map indexed by key name.
+ * The internal cursor (row counter) is incremented by one.
+ * @returns A reference to the current row's SQLfieldMap
+ */
virtual SQLfieldMap& GetRowMap() = 0;
-
- /* Like GetRow(), but returns a pointer to a dynamically
+
+ /**
+ * Like GetRow(), but returns a pointer to a dynamically
* allocated object which must be explicitly freed. For
* portability reasons this must be freed with SQLresult::Free()
+ * The internal cursor (row counter) is incremented by one.
+ * @returns A newly-allocated SQLfieldList
*/
virtual SQLfieldList* GetRowPtr() = 0;
-
- /* As above, but return a map indexed by key name */
+
+ /**
+ * As above, but return a map indexed by key name
+ * The internal cursor (row counter) is incremented by one.
+ * @returns A newly-allocated SQLfieldMap
+ */
virtual SQLfieldMap* GetRowMapPtr() = 0;
-
- /* Overloaded function for freeing the lists and maps returned
- * above.
+
+ /**
+ * Overloaded function for freeing the lists and maps
+ * returned by GetRowPtr or GetRowMapPtr.
+ * @param fm The SQLfieldMap to free
*/
virtual void Free(SQLfieldMap* fm) = 0;
+
+ /**
+ * Overloaded function for freeing the lists and maps
+ * returned by GetRowPtr or GetRowMapPtr.
+ * @param fl The SQLfieldList to free
+ */
virtual void Free(SQLfieldList* fl) = 0;
};
+
+/** SQLHost represents a <database> config line and is useful
+ * for storing in a map and iterating on rehash to see which
+ * <database> tags was added/removed/unchanged.
+ */
+class SQLhost
+{
+ public:
+ std::string id; /* Database handle id */
+ std::string host; /* Database server hostname */
+ std::string ip; /* resolved IP, needed for at least pgsql.so */
+ unsigned int port; /* Database server port */
+ std::string name; /* Database name */
+ std::string user; /* Database username */
+ std::string pass; /* Database password */
+ bool ssl; /* If we should require SSL */
+
+ SQLhost()
+ {
+ }
+
+ SQLhost(const std::string& i, const std::string& h, unsigned int p, const std::string& n, const std::string& u, const std::string& pa, bool s)
+ : id(i), host(h), port(p), name(n), user(u), pass(pa), ssl(s)
+ {
+ }
+
+ /** Overload this to return a correct Data source Name (DSN) for
+ * the current SQL module.
+ */
+ std::string GetDSN();
+};
+
+/** Overload operator== for two SQLhost objects for easy comparison.
+ */
+bool operator== (const SQLhost& l, const SQLhost& r)
+{
+ return (l.id == r.id && l.host == r.host && l.port == r.port && l.name == r.name && l.user == l.user && l.pass == r.pass && l.ssl == r.ssl);
+}
+
+
+/** QueryQueue, a queue of queries waiting to be executed.
+ * This maintains two queues internally, one for 'priority'
+ * queries and one for less important ones. Each queue has
+ * new queries appended to it and ones to execute are popped
+ * off the front. This keeps them flowing round nicely and no
+ * query should ever get 'stuck' for too long. If there are
+ * queries in the priority queue they will be executed first,
+ * 'unimportant' queries will only be executed when the
+ * priority queue is empty.
+ *
+ * We store lists of SQLrequest's here, by value as we want to avoid storing
+ * any data allocated inside the client module (in case that module is unloaded
+ * while the query is in progress).
+ *
+ * Because we want to work on the current SQLrequest in-situ, we need a way
+ * of accessing the request we are currently processing, QueryQueue::front(),
+ * but that call needs to always return the same request until that request
+ * is removed from the queue, this is what the 'which' variable is. New queries are
+ * always added to the back of one of the two queues, but if when front()
+ * is first called then the priority queue is empty then front() will return
+ * a query from the normal queue, but if a query is then added to the priority
+ * queue then front() must continue to return the front of the *normal* queue
+ * until pop() is called.
+ */
+
+class QueryQueue : public classbase
+{
+private:
+ typedef std::deque<SQLrequest> ReqDeque;
+
+ ReqDeque priority; /* The priority queue */
+ ReqDeque normal; /* The 'normal' queue */
+ enum { PRI, NOR, NON } which; /* Which queue the currently active element is at the front of */
+
+public:
+ QueryQueue()
+ : which(NON)
+ {
+ }
+
+ void push(const SQLrequest &q)
+ {
+ if(q.pri)
+ priority.push_back(q);
+ else
+ normal.push_back(q);
+ }
+
+ void pop()
+ {
+ if((which == PRI) && priority.size())
+ {
+ priority.pop_front();
+ }
+ else if((which == NOR) && normal.size())
+ {
+ normal.pop_front();
+ }
+
+ /* Reset this */
+ which = NON;
+
+ /* Silently do nothing if there was no element to pop() */
+ }
+
+ SQLrequest& front()
+ {
+ switch(which)
+ {
+ case PRI:
+ return priority.front();
+ case NOR:
+ return normal.front();
+ default:
+ if(priority.size())
+ {
+ which = PRI;
+ return priority.front();
+ }
+
+ if(normal.size())
+ {
+ which = NOR;
+ return normal.front();
+ }
+
+ /* This will probably result in a segfault,
+ * but the caller should have checked totalsize()
+ * first so..meh - moron :p
+ */
+
+ return priority.front();
+ }
+ }
+
+ std::pair<int, int> size()
+ {
+ return std::make_pair(priority.size(), normal.size());
+ }
+
+ int totalsize()
+ {
+ return priority.size() + normal.size();
+ }
+
+ void PurgeModule(Module* mod)
+ {
+ DoPurgeModule(mod, priority);
+ DoPurgeModule(mod, normal);
+ }
+
+private:
+ void DoPurgeModule(Module* mod, ReqDeque& q)
+ {
+ for(ReqDeque::iterator iter = q.begin(); iter != q.end(); iter++)
+ {
+ if(iter->GetSource() == mod)
+ {
+ if(iter->id == front().id)
+ {
+ /* It's the currently active query.. :x */
+ iter->SetSource(NULL);
+ }
+ else
+ {
+ /* It hasn't been executed yet..just remove it */
+ iter = q.erase(iter);
+ }
+ }
+ }
+ }
+};
+
+
#endif
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